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"In late 2009, all S, SE and SW carriages were required to be modified so that their pneumatically-operated interior doors open automatically if the compressed air supply is lost. This was identified as an issue after the locomotive on a Wairarapa Connection train derailed when it hit a landslide on 23 July 2009, resulting in the locomotive having to be shut down and cutting the compressed air supply to the SW carriages in the process. The doors stuck in position, and three people were required to open them manually, sparking safety concerns that the carriages could not be evacuated quickly in the event of a fire.[2]
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